most of the newbies tends to be excited to buy things. which only rare you'll get satisfied in the end. unless you get lucky to buy the ones you will really need.
my opinion, use the kit lens. if you get to be confident on how you use aperture, shutter speed, iso and stuffs, that is where you start looking for reviews on which lens is good for your portraits and landscapes.
But still, 50mm f/1.8, i doubt everyone loves it. aside from the quality photos it produces, its very affordable.